Please help - Losing and thinning hair at crown and vertex

[hairlost29]

Hello,
I'm 34 now. My current crown and vertex part is shown in the pics attached. I have been using minoxidle 5% since 6 years to maintain my hair (crown and vertex). It was much thicker when I started using minoxidle however as aging my current hair is thinning. Also I have stopped using hair oil almost 20 years back and recently started using Bringraj oil since 2 months and didn't see much improvement.

What are the options that I can get much thicker hair in the crown and vertex part? Please advice. Appreciate your response.